block ram implementation

[matrix83]

hi,
i had written a code in vhdl for matrix multiplication for which i predefined data to be multiplied...now i need to replace that predefined data with block ram...can anyone help me out how to do this?

 

[shahbaz.ele]

first you have to define block ram
introduce some delays
put your data one by one in block ram

you have to design a complete state machine.

by the way can you share yor code here,
so that we may suggest you better answere.

 

[matrix83]

hi
thanks for the reply...well sorry i didn't mentioned something in my post which is i need to retrieve the data from block ram and then perform mac operation and then send the result back to block ram..

 

[jimwu88]

Take a look at the post below on methods for initializing block rams with your predefined data.

https://myfpgablog.blogspot.com/2011/12/memory-initialization-methods.html

hi
thanks for the reply...well sorry i didn't mentioned something in my post which is i need to retrieve the data from block ram and then perform mac operation and then send the result back to block ram..

 

[matrix83]

thanks jim,
but again i ma saying that i need to retrive data from block ram....for my computation...for taht purpose help me out

 

[FvM]

Study how block RAM works and change your code to consider the necessary sequential access method. Only one RAM word can be accessed at a time (or optionally two when using dual port RAM).

 

[mrflibble]

thanks jim,
but again i ma saying that i need to retrive data from block ram....for my computation...for taht purpose help me out

I suggest reading the datasheet for the BRAM you intend to use. Reading datasheets is awesome! It solves all sorts of problems that you would have when you don't read them.

So after reading it you know the limitations + timings of your BRAM du jour. And then you can write a small FSM to do your "read, computate, write" stuff. Sounds like fun! Man, I should read documentation more often.

 

[fpgadsgnr]

Hi Matrix,
Refer to the post on https://learnfpga.blogspot.in/2012/06/coding-styles-for-different-ram.html, this ongoing tutorial will help you understand different configurations and modes that a block RAM can support.

Thanks,
FPGA Designer